Eugenic de zuccato



UN rrnn TATES ATENT Fries.

EUGENIO DE ZUOOATO, OF LONDON, ENGLAND.

MANUFACTURE OF STENCIL-SHEETS.

SPECIFICATION forming part of Letters Patent No. 548,1 16, dated October15, 1895.

Application filed March 4, 1895.

To all whom it may concern.-

Be it known that I, Euenmo DE ZUCOATO, manufacturer, a subject of theKing of Italy, residing at 15 Oharterhouse Street, in the city ofLondon, England, have invented an Improved Manufacture of StencilSheets, of which the following is a specification.

My invention relates to an improved manufacture of stencil-sheets-thatis to say, of the material or fabric from which stencils maysubsequently be made.

My improved material is particularly adapted for use in making stencilsby means of a type-writer. It has heretofore been the custom to use forsuch purposes a kind of J apanese paper well known in the trade, treatedwith stearine, paraEfine-wax, or similar substances, such paper sotreated. possessing the property of allowing the types of the typewriterwhen the paper is placed upon a suitable surfacesuch, for instance, as apiece of silk gauze resting on the platen of the machine-to form theircharacters in said paper without thoroughly punching it out orbreakingit through. Such paper remains impermeable to the ink which isbrought into contact with it when employed for stenciliug except atthose places where the paper has been impressed by the types of thetype-writer. It is found, however, that the aforesaid paper made in thismanner when used with a typewriter for the purpose of making stencilshas certain disadvantages. For instance, sometimes the wax becomesdetached from the paper and clogs the silk gauze or othersurface uponwhich it rests. Such waxed paper is, moreover, exceedingly brittle andrequires great care in handling to avoid injury to the same.

According to my invention I produce improved stencil-sheets consistingof thin paper or other fabric coated with a resin or gum or a similarsubstance and rendered limp and pliable by being impregnated withglycerine.

In carrying my invention into practice I proceed as follows -that is tosay, I use a very thin and light paper of good quality free, as far aspossible, from pin-holes and preferably possessing a long fiber. A goodthin tissuepaper, for example, will be found serviceable for thispurpose. I coat the same with a so lution of shellac in alcohol, such asgilders Serial No. 540,496- tspecimens.)

lacquer, or any other suitable varnish. This may be done by means of abrush, and several coatings may be applied, according to the substanceof the paper and according to the body of the varnish. When this coatedor varnished paper is dry, I impregnate it with pure glycerine or asolution of glycerine and water or glycerine and spirit to permanentlymoisten the paper, thus rendering the sheet limp and plastic.

When properly soaked, the paper is blotted with paper to get rid of thesurface moisture, or such moisture is removed by any other suitablemeans.

According to another and preferable method of producing thestencil-sheets I mix the glycerine with the resin or alcoholic varnishand then coat the paper with this mixture, thus impregnating the paperwith the glycerine and coating it with the resin or varnish at one andthe same operation. The proportions of the glycerine and resin that Ihave found to give satisfactory results are about one pint of glycerineto about one gallon of gilders lacquer. This mixture may be diluted witha suitable quantity of spirits of wine even up to an equal part of itsbulk, by measure, for the purpose of rendering it of thinnerconsistency, as I find that a thin mixture adheres better to the paper.I coat the paper three or four times with this mixture on one or both ofits sides, it being understood that in coating both sides of the paperthe number of coatings above mentioned should be distributed between thetwo sides.

I wish it to be understood that I do not limit myself to the preciseproportions above stated, as such will vary according to the quality andthickness of the paper employed and according to the quality and body ofthe resin or alcoholic varnish used. The object of using the resin oralcoholic varnish is to fill up the pin-holes of the paper and to makeit inkproof, as far as possible, Without, however, in terfering with theplasticity imparted to the paper by the glycerine.

It is well known that glycerine at ordinary temperatures does notreadily change its state. Hence paper treated as above described willremain in a moist and plastic condition for a considerable length oftime.

The glycerine with which the varnished paper is impregnated renders itvery pliable, flexible, and plastic and capable of being per foratedwith innumerable interstices at those parts where the types strike thepaper during the type-writing operation without the characters formed bythe said types in the paper being cut or broken out or punched outaltogether, which would be the ease with ordinary tissue-paper and othersimilar papers, if the same were hard and stiff.

Although my improved stencil-sheets are particularly adapted for usewith a typewriter, it is clear that they may be employed as stencils forother uses.

I am aware that sheets of paper coated With a solution of resin havebefore been used in the so-called papyrograph process, for which Iobtained United States Patent No. 157,161; but such sheets were used toobtain an entirely diiterent result to that now in View and would not inany Wise be suitable for my present purpose.

That I claim is 1. The method of rendering paper suitable for makingtypewriter stencils therefrom by treating the same with resin andglycerine EUGENIO DE ZUCOATO.

Witnesses:

P. H. BUDGEN, '1. F. BARNES.

